Tie for concrete centering.



B. A. HOWES.

TIE FOR CONCRETE CENTERING.

APPLICATION ElL'ED 11213.6. 1911.

1,1? 7,950. Patented A r. 4,1916.

(UNITED STATES PAEFENT orrion.

BENJAMIN n Howns, or New roan, N. r. I

TIE FOB CONCRETE CENTEBING.

Application filed February 6, 1911. Serial No. 606,679.

To all whom it may concern:

Be it known that I, BENJAMIN A. Howns, of New York city, borough of Manhattan, in the county of New York and State of 5 New York, have invented new and useful Improvements in Ties for Concrete Centering. of Which the following is a specification. This invention relates to means for secur 'ing in place the sections of the molds or centering which retain the concrete. or other plastic mass, forming the wall of a structure, before it has set, which securing .means are commonly referred to practice as ties.

In forming a concrete wall for a building, it is the usual practice to build up the centering on each side of the space to be occupied by the concrete wall by laying up boards or planks edge to edge so that retaining walls for the concrete, before it has set, are formed on both sides. To secure the, sections, usually planks orlboards, of the centering, ties may be employed, which ties extend into the concrete space between the retaining walls and engage with the retaining walls. When the concrete is filled in between the retaining walls, the ties become embedded. After the concrete has set to the desired degree, the retaining walls are removed when the ties pro- 0 ject from the concrete wall. These projecting ends of the ties must be removed in order that the surface of the wall may be smooth and present a sightly appearance. It is a further desideratum that the wall shall not be marred in removing the-projecting ends of the ties, and further that the wall shall remain, water-tight so that moisture cannot pass through the wall from one side to the other. 40 It is an object of the present invention to rovide an eflicient tie for securing-centering which shall permit the easy removal of the ends projecting'from the concrete after the centering has been taken down, and without marring the wall.

It is a further object of the invention to provide a tie of which the projecting end may be removedwithout impairing the wator-tight character of the wall. Other objects of the invention will appear hereinafter.

In. the accomp' ying illustrate the invention, Figure 1 is a side view of a tie embodying the invention; Fig.

2 is a. cross section on the line A-B of Fig.

Specification of Letters .Patent.

"so that watertight joints are drawings, which c by section by pulling out the bottom of a Patented Apr. 4, 1915.

1; Fig. 3 is a view, similar to Fig.1, of a tie like that shown in Figs. 1 and 2, having its bent ends sharpened and adapted for use as driven fastenings; Fig. 4 is a cross section of atie the same as shown in Fig. 1 or Fig. 3 but having a polygonal cross section. Fig. 5 is a transverse section of a concrete wall with sections of centering applied thereto, showing the relations of the wall, centering and ties, when the centering is .in retaining 6 position. Fig. 6 is a view similar to Fig. 5 showing the manner of removal of centering sections, the sections upon one side having been taken down and the projecting ends of ties upon that side having been removed, and Fig. 7 is a side elevation of a tie having a cross-section as shown in Fig. 4.

Referring to the drawin s, and first to Figs. 1 and 2, the tie compfises a rod 1 of circular cross section, having its ends 2 and 3 bent at an angle With the main axis of the 'tie,'and a bend 4 forming a lateral extension,

at an intermediate portion. Adj acent' to the ends, and between the bend 4 and the ends, are notches, 5 and 6 which serve to reduce. and weaken the sections of the tie at the points referred to.

In Fig. 5 is shown centering for a concrete wall. On one side it is built up of the sections 7, 8 and 9 (usually wooden boards) laid edge to edge, while on the other side theretaining wall is similarly laid up of the sections 10,11 and 12.

The ties extend from between adjacent sections inone retaimng wall, through the @space for the concrete, and between adjacent sections of the opposite retaimng wall. each retaining wall a tie engages with asection, to prevent its outward movement, upon f one side only of the tie. The arrangement'of' centering sections and ties is clearly shown in-the drawing. stood that the arrangement may be extended to any desired extent by adding sections and ties.

The concrete 13' is filled in between the retaining walls and embeds the ties as shown. As the concrete sets, it firmly grips the ties formed and moisture cannot'pass a ong the tie from one side of the concrete walltothe other.

The centeringimaybe taken down section ion It will, of course, be underi each tie engaging, to prevent such movement, with the section on one side only.

After the centering has been taken down as described, the ends of the ties will project from the concrete wall and must be removed to make the wallsmooth and sightly. This can be done by gripping each projecting end with a suitable tool and twisting it, when the tie will part at the adjacent weakened section, just inside the face of the wall. The severed end can then be removed and the hole pointed with cement if desired.

The tie shown in Figs. 1 and 2, being formed of a rod of circular cross section, the portions between the weakened sections and the ends are of circular cross section. This permits these portions to be easily turned about their axes in the concrete, in twisting them off, while the lateral extension/l prevents turning of the intermediate portion of the tie. By removal of the tie-end in the manner described, the intermediate portion of the tie, which remains in the wall, does not have its water-tight relation with the concrete impaired so that the concrete wall remains water-tight.

It will, of course, be understood that a tie having its intermediate portion of, any suitable conformation which would engage with the concrete to resistturning, could v be used.

The cross section of the portion between a weakened section and its adjacent end, need not be circular in all cases but may be bounded by a polygon having its sides at equal distances from its center, as shown in Fig. fl. The [number of sides of the polygon may vary, and, of course, the circle is the limit of the polygon as its sides are increased in number.

With the bent ends of the tie blunt, as in Fig. 1, holes or recesses would ordinarily have to be prepared in the edges of the centering sections to receive these ends. The sharpened ends shown in Fig. 3 can be driven into the edges of the sections and the latter require no special preparation in this regard.

It will be apparent that various modifications and changes can be made of the structures shown in the drawings without departing from the spirit of my invention, which is not therefore limited to the structures shown.

. What I claim is:

1. A tie for concrete centering of substantially circular cross section having a lateral extension between its ends and a weakened section between said extension and each end and remote from the face of the wall to be formed, the tie ends being adapted to be twisted off at the weakened sections, the-said cross-section permitting the twisting without marring the face of the wall. I

2. A, tie for concrete centering having a lateral extension and a weakened section between said extension and each end and remote from the face of the wall to be formed, the tie being substantially circular in cross section between each of said weakened sections and the end to which it is adjacent, the tie ends being adapted to be twisted ofi at theweakened sections, the said cross-section permitting the twisting without marring the face of the wall.

3. A tie for concrete centering having a portion adapted to resist turning of the tie weakened section adjacent to one'end but inside theface of the wall to be formed, said tie between said weakened section and said end being of substantially circular cross section, the tie end being adapted to be twisted off at the weakened section, the said cross-section permitting the twisting without marring the face of the wall.

5. A tie for concrete centering having an intermediate portion adapted to resist turning of the tie in a mass in which it may be embedded, a weakened section between said portion and each end and remote from the face of the wall to be formed, said tie between each weakened section and its respective end being of substantially circular cross section, the tie ends being adapted to be twisted ofl at the weakened sections, the said cross-section permitting the twisting without marring the face of the wall.

6. Atie for concrete centering having 1. weakened section adjacent to each end but inside the faces of the wall to be formed, said tie between each of said weakened sections and its respective end being of a substantially circular cross section. the tie ends being adapted to be twisted off at the weakened sections, the said cross-section permitting the twisting without marring the face of the wall.

7. A tie for concrete centering comprising a rod, substantially circular in section, bent at an intermediate point to form a lateral extension and havinga weakened section upon each side of said extension and remote from the face of the wall to be formed,

and having its ends bent at an angle to form a fastenlng to the centering, the tie ends being adapted to be twisted ofi at the I crete or other plastic material, of a plurality of mold sections on each side of the space for the material to be molded, a tie extending between adjacent sections at each side of said space but engaging one only of the sections between which it extends to prevent lateral movement thereof, said tie having an intermediate lateral extension or offset and a weakening notch between its end and said offset and remote from the face of the wall to be formed, said notch and ofiset being located within said space and said tie, between said notch and its end, being of a substantially circular cross-section, the tie end being adapted to be twisted oil at the notch, the said cross-section permitting the.

twisting without marring the face of the Wall.

9. A tie for concrete centering consisting of an integral bar of substantially circular cross-section, said bar'being bent at an intermediate portion to form a lateral extension or ofiset, having its ends bent at right angles to iformv section engaging means and notches in said bar between said lateral extension and its ends, said notches being remote from the faces of the wall to be "formed, and the tie ends being adapted to .be twisted oif at the notches, the said crosssection permitting the twistingwithout marring the walls.

In testimony whereof I have hereunto set my hand this twenty-eighth: day of J anuary 1911 in the presence of two witnesses. v

I BENJAMIN A. HOWES.

Witnesses:

ADALINE HOLMGREN, LILLIAN'ROSENFELD. 

